Catecholamine Fractionation, Plasma
Catecholamines, Free, Plasma
Catecholamines, Unconjugated, Plasma
Clonidine Suppression Test
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HPLC with electrochemical detection
The three catecholamines (norepinephrine, epinephrine, and dopamine) are the principal secretory products of neural tissue. Clinically, the measurement of circulating catecholamines is valuable in the diagnosis of catecholamine secreting tumors associated chiefly with hypertension (phechromocytomas, neuroblastomas, and gangliomas) and with the evaluation of orthostatic hypotension.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
The patient should fast overnight and abstain from nicotine, caffeine, alcohol, and strenuous exercise for three hours prior to specimen collection. Patients should be relaxed in either a supine or upright position before blood is drawn. Collect specimen in a pre-chilled green top tube. Centrifuge, aliquot plasma into a plastic vial and freeze within 30 minutes of collection.